need no enjoy yes
Sure they do! Especially if they have their owner well trained.
I think they need toys too...sometimes, when they're in a playful mood..I have a ball for my 6 year old cat and she plays with it sometimes.
Adult cats are mean,like my Kuzea....his goal is to kill me...slowly and painfully....
Cats (young and old) will generally entertain themselves without the need for cat toys. They'll entertain themselves with the furniture, with each other, with leaves in the garden, whatever is at hand (or should that be "at paw"?). But if you want to save your furniture, or your socks, or whatever else might fall foul of those claws; get some cat toys. Cats never reach an age where they stop playing altogether.
I know plenty of adults who need toys to entertain themselves with.. Animals young, and old have the same tendency towards possessing things as humans do.. so I would say yes, indulge them a little..
Adult cats don't need anything, except your devotion.